Get a Free Business Legal Evaluation. Fill out the form below and one of our team members will be in touch immediately!• Instructions for Completing a Contract for Professional Services. • How to determine when to use a Contract for Professional Services vs. Simultaneously, the escrow agent in Maricopa reviews and verifies the necessary documents related to the sale. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer. Internal Sale Input Form should be completed. TIMING: The department purchasing the asset should complete the Internal Sale.